Dump wagon



Nov. 15, 1932'. J. D. BENBOW ET AL DUMP WAGON Or g a Filed April 17, 1928 4 Sheets-Sheet l Nov. 15, 1932. J. D. BENBOW ET AL 1,337,914

DUN; WAGON Original Filq April 17,1928 4 Sheets-Sheet 2 Fig 79 Nova 15, 1932; J. D. BENBOW ET AL DUMP WAGON n l Filed April 17, 1928 4 SheetsSheet 5 Awa Nov. 15, 1932. J. D. BENBOW ET AL ,9

DUMP WAGON Original Filed April 17, 1928 4 Shets-Sheet 4 fufenfig I WMHMM WU L M II. IHZA u .m n

II.- I Mm a 755154545! 4" Patented Nov. 15, 1932 uNrrEo STATES.- PATENT} OFFICE mains n. nnnnow Ann JeMns B. GREEN, 01-- annona, rtnmors, assreivons 'ro' WESTERN wnnnnnn SCRAPEE or ILLINOIS COMEANY, AURORA, ILLINQIS,'A CORPORATION.

DUMP WAGON Original application filed April 17, 1928,

The resent invention relates to dump wagons, and is divisional of our co-pending application Serial No. 270,645, filed April 17,

dump tures, doors mechanism for operating the doors; Thepresent application is directed to this winding mechanism and to the mannerin which the same is operatively connected with the doors. The wagon is supported onendless self-la ing tracks or treads disposed atopposite sides of the wagon and mounted on an arched axle structure extending transversely.

of the load carrying bed intermediate the ends thereof. Such construction, in relatively long wagons, makes it desirable to employ two pairs of dumping doors, one pair dis-.

' posed forwardly of the arched axle struc-.-

ture and the other pair rearwardly-thereof. One of the principal obgects of the present inventiouis to provide an improved'construction of winding mechanism capable of operation for raising all of the doors simultancously, or for raising lectively.

Another object of the invention is to pro.-

vide improved tripping means associated \viththe winding mechanism and'arranged whereby the rear pair of doors can be droppedindependently of the-front pair of doors, the front pair of'doors cannot be :drepped independently of the rear pair of.

doors; buch construction prevents the possibility of a load condition arising which might tilt the wagon backwardly around the intermediate pivotaz-zis of the endless tread units.

Another object of the invention is to provide an improved arrangement of the chains or other flesiblemembers operatively con-' necting the ,winding-mechanism with the tien will appear in the followingdescription d embodiment thereof. Inthe embodiment diii'erent doors se-- I I sills of the wagon bed, such beams preferably The rear ends 7 Serial No. 270,645. Divided and this application filed January 5'," 1929. Serial No. 330556. f i

Fig. 1 isa longitudinal sectional view" through the improved wagon; p

Fig. 2'is a transverse sectional view thereof, taken approximately on the plane ofthe line 2-2 of Fig. 1; i V 1 Fig.3 is a diagrammatic perspective view illustrating the paths of the chains extending. from the winding mechanism to the several dump doors;

Fig. 4::is a plan view, partly in I section,

showing the construction of the winding mechanism Fig. 5 is a sectional View transversely through the winding mechanism, taken approximately 011 the plane of the line 55 of Fig. l; r

Fig. 6 is a fragmentary perspective. view of the two tripping pawls of the winding mechanism; l i

Fig. 7 is an enlarged longitudinal sectional View. through the front end of the winding handle; and

Fig. 8 is a transverse'sectional view taken on the plane ofjthe'line 8-8 of Fig.7.

The frame of the wagon comprises two longitudinal beams 11,'cons tituting the side being of channel section; thereof' are joined by a transversechannel beam 12 which is suitably'secured to the longitudinal beams 11 by gusset plates riveted to p the adjoining ends of the three beams.

The front ends of the side beams ll'are securedto an elevated frameextension 13' comprising two channel bars'llprojecting side beams 11. Plates 15 extend upwardly.

both channels for joining the same together.

The bedof the wagon'isof hopper shape having sloping sidewalls, and comprises plates 16 which are suitably secured to the frame structure, as bestshown in Fig. 2. The self;

laying tracker endless tread units are in- 85. forwardly from and above the ends of'the dicated at 18,: it being noted that these units 1 I are disposed approximately midway'between treads carry practically all of'the load.

In n ost instances, thefront end of the the ends of the'load carrying-bed so thatthe n f Wagon will be supported on a wheeled truck 19, although the construct-ion is such that this wheeled truck can be easily removed so that the front end of the wagon may be mounted directly on the tractor .or other'pulling ve hicle.

Intermediate the ends of the bed is a transverse partition or dividing wall 22 (Fig. 1) which separates the interior of the bed into front and rear compartments. The structure which supports the two endless tread units 18 is built into this transverse partition. The rocker beam of each tread unit is pivotally supported on a stub axle 23 which is mounted r in an axle bracket 24 joined to the frame within the transverse partition 22. 7

Referring to Fig. 2, it will be observed that the bracket 24 comprises an outwardly and downwardly inclined arm, which is preferf ably hollow and suitably reenforced, and

which carries a hub 25 at its lower end in which the stub shaft or axle 23 is mounted. The-upperend of each bracket 24 is formed with a horizontally extending box-like portion26 having atits outer'end laterally projecting attaching flanges 27. (Fig. 1) which are bolted or riveted to the inner side of the adjacent frame channel 11. As shown in said latter figure, two channel bars 28 extendtrans- ,versely from'side toside of the frame and have their flanges facing inwardly towards each other for embracing the upper and lower sides or the box-like/portions 26 .ofboth brackets. The channel bars 28 are bolted to th'elatter portions of the brackets,.thereby providing,in effect, a heavy strut extending between the brackets and sustaining the sagginger spreading stresses set up between the two axle brackets. As shown in Fig. 2, the inner ends ofthe two box-like portions 26 are separated'to provide a passageway down between the two channel bars 28, 28, through which passageway certain of the hoisting chains can-pass to the dumping doors, as. will 5 ;be presently described. Referring to Fig. 1,

plates 29'are secured to the outer sides of the channel bars 28 and extendupwardly approximatelyto the top of the body, where they are, converged together and secured to the opposite sides of a bar 31 extending transver'sely between the side walls 16, 16. These platescomplete the tapering upper portion of the transverse jpartition or dividing wall 22. I

The bottom of the compartment defined in front of the partition 22 is closed bytwo doors-32, 32 and the bottom of the compartment defined inrear of i the partition 22 is closed-by two similar doors33, 33. One; A 3 preferred manner of, constructing these doors.

5-? secured over the upper side of areenforced frame structure and having their lateral edges bent around the lateral edges of the frame structure. Each door is so constructed that a longitudinal passageway 34 (Fig. 2)

is formed therein adjacent to its inner edge,

such passageway extending entirely from end to end of the door and receiving the hoisting chain associated with that particu permits 'the hinge movement of the doors down into their dumping position, and also permits the doors to shift upwardly and downwardly, when in'their dumped position, sothat they can clear themselves from the dumped pile and other obstructions as the wagon is being drawn away after dumping.

The arrangementof the chains for raising the several doors will .be best understood by. reference to'the diagrammatic illustration in Fig. 3. i

The winding mechanism is located atthe front end of'the wagon and comprises two co-axr'al shafts '39'and 41. Mounted on the shaft 39 are three helically grooved winding drums 42, 43 and 44, and mounted on the other shaft 41 is a similar winding drum 45. Connectedto and windingabout the drum 42 is1a chain 46 which extends along one side of the wagon and passes downwardly around a pulley 47 :disposed intermediate the endsof the wagon. To the end of the chain 46'is connected an equalizing bar 48, to the endsv of which, in' turn, are, connected two chains 49 and 51. The latter chains extend downwardly to the free, inner edges of the two doors 32, 32 and pass forwardly through the guide passageways 34 in their respective doors. .Passing outwardly from the front edges of the doors, these chains extend upwardlyto the two winding drums 43 and 44. It will be evident that, in a winding rotation of the three drums 42, 43 and 44, theoppositeends of the two chains 49 and 51 will be drawn upwardly, thereby raising both doors 32 and 82 to closed position. The equalizing bar or link 48 compensates for any inequality in the lengths of the two chains and results in both doors being raised under equal forces.

Connected to and winding about the other drum is a chain 53 which extends rearwardly along the other side of-the wagon. This chain'is linked to two chains 54- and 55, the first of which extends back to the rearLend of the wagon and the second of whichpas'ses downwardly around a pulley 56 disposed intermediate the ends of the wagon. V

The. end of thelatte-r chain is connected to an equalizing link or bar 57, the two arms of which are in turn connected to two chains "58 and 59. Such chains extend down to the 61. The chain 54, which extends back to the 'rear end of the vehicle, passes downwardly around a pulley 62 and is connectedto the equalizing bar 61. It will be evident that windin rotation of the drum 45 will draw upwardly on the two chains 54, 55, thereby pulling upwardly onopposite ends of the two T hoisting chains 58 and 59 and raising the doors 33, 33 to closed position. Theinter 0- sition of the equalizing bars 57 and 61 e ..tween the ends of t-helatter chains and the ends of the pulling or winding chains 54, 55

result in equal lifting forces being transmit;

ted to both doors.

Those portions of the chains extending back along the sides of the wagon are pref "erably housed over on the top' to prevent the possibility of the chains being struck by'the loading shovel or having material dropped thereon. In the construction shown in Fig. 2,

. the upper margins of the side plates 16 are bent outwardly to form the top flange 65 and are then bent downwardly to form the outer flange 66. These flanges reenforce the upper edges of the side plates 16 and also -form protecting enclosures or channels in which are disposed the longitudinally extending portions of the chains.

A series of straps or bars 67 are preferably extended between the lower edges of the flanges 66 and the side walls 10f the bed at spaced points along the'length of .the bed,

such straps or bars providing a plurality of supports and preventing the chains from dropping down out of the channel.

As best shown in Fig. 2, the two intermediate. sheaves or pulleys 47 and '56 are disposed in openings cut in the side plates 16, being supported in suitable brackets disposed at an angle so as to direct the chains 46 and inwardly and down into the hollow partition 22. The openings in the side plates 16, in

which these pulleys are disposed, may be covered by suitable bulged plates to prevent the entrance of dirt down into the interior of ,the partition 22. Fig. 2 shows the two hoisting chains 58 and 59 extending downwardly between'the side walls 29, 29 of such -parti.

tion and passing down around two pulleys 72 and 73. The pivot axes of such pulleys are supported in brackets mounted on the upper edges of the transverse channels-28,, 28, as shown in section inFig.1. The chains 58, 59 pass downwardly from these pulleys through thespace intervening between the inner ends of the box-like bracket portion 26 and then extend rearwardly through the passageways 34 provided in theitwo rear' doors- .pulleys 7273, but disposed slightly forwardly thereof, and extend down betweenthe" bracket portions 26 and thence forwardly through passageways 34 in the front pair r doors 32, 32.

It will thus be seen that the hollow partition or dividing wall 22 serves'the'two-fold purpose of a transverse strut, reenforcing the 4 intermediate portion of the wagon against sagging or spreading stresses in thetran'sverse plane of thetread units 18, and also serves as a housing or enclosure through whichthe hoisting chains canbe' extendedj to theinner ends of both pairs of doors.

As previously described, the'chain 54 ex-- tends to the rear end 'of the wagon and passes downwardly around a pulley 62, Such pulley is suitably supported in a bracket mounted' at'the rear corner of the bed'within the ice 1 channel guide 66. The rearends of the two hoisting chains 58, 59, which connect to this chain 54, pass down varound pulleys 69, (Fig. 3) similar to the pulleys 72, 73,

which are suitably supported at the rear end 2.

be'seen that thei-two winding shafts 39 and i 41 have bearing'support in two outer bear ing brackets 83 which "are suitably secured to the front wall of the bed. The proximate ends of said shafts also have bearing sup port in brackets 84, between which is dispos'ed a housing85, the shaft ends entering this housing through bearing bosses 86,;the latter affording a rotatablesupport' .of the housing 85 on the shafts. Keyed to the ends of therespective shafts within the housing; Q

85 are ratchet 'wheels'87and88.

The forwardly extending portion 'ofthe housing supports a transverse pivot shaft 89 on which two independently acting pawlsf I 91 and 92 are mounted." The front portion of the'housing '85 is formed with a split clamping extension93 in which 'is' secured" a tubular operating lever or handle 94; Passing forwardly through such handle are two 1 control rods 95 and 96whichhave their'rear ends bent laterally for effecting pivotal connection withilugs projecting from the pawls 91,92, as indicated at 97. As shown in Fig, j

5, a tension spring 98 is connected to the lower portion'of each pawl, these springs normally tending to withdraw the two .pawls from the teeth of their respective ratchet wheels 87 and 88. Rearward thrusting movement of; the rods 95, 96 isefl'e'ctive to swing the'jpawls into the teeth of their" ratchet wheels jn'o position to the act-ionof the springs 9.8. It

will be evident that with the pawls thus en gaged in the ratchet Wheels, vertical oscilla tion of the operating handle .94 iseifective. to transmit winding rotation to' the two i Each of these locking or detent pawls has a shafts 39 and 41 .1

Both control rods may bethrust rearward;

ly inunison, or one control rod be, thus;

actuated independently of the other through front end of the handle 94. Thrustinginove ment imparted to the rods through a lever 1 w h adapted to be squeezed toward the handle 94 in the act of gripping the end in a bracket 103' encircling the handle 94, the

transverse swinging movement across the face of the block about a pivot screw11-00 extending through the member and into the block. The lower portion. of the selector member 105 extends down into the tubular.

handle 94 and comprises va pallet shaped portion 107 whichis adapted to occupy any one of the different positions indicated in'Fig. 8.

effective to transmit movement. to the ends of both control rods 95 and 96-, and by moving the selector member to one side or the transmit movment to-one of the rods without transmitting movement to the other. a The selector member is yieldinglyheld in each of these three positions by a spring pressed ball 7 108, mounted in a recess in the block 104. Said ball has detent engagement in depressions fa med i th a a Se ment m m: her 109 carried .by the upper fingerportion of the-selector member. It will be apparent handle, the selector member will oscillate correspondingly and will transmit movement to either orboth-control rods 95,96, depending upon the position in which the selector mem her is placed with reference to the lever 101. I Hence, by appropriately placing the selector v member in one position or the other, the windmgmechanism 1s madeefiectlve to raise both pairs of doors simultaneously with the;

stroking ofthehandle94, or to firstraise one pairof doors, and by then shifting the selec-.

tor member, to raise the other pair of doors.

Thetwo ratchet wheels 8'f and .88 are normallyheld against retrograde movement by two locking pawls 111,111, engaging respec tively in the teeth of their'associated ratchet wheels, 'below the operatingor advancing pawl 1, 2- Th tw ocking Pawls r the operation-of; selecting mechanism at the,

. of the handle. Said lever'is'rota-tably sup-f ported on a pivot pin 102 which is supported In its intermediate position, such extension is, I

other such extension is placed in position to that, in squeezing the lever 101 toward the cranl; levers 114, 114. Such bell crank levers are pivotal 1y supported on a'fixedshaft 115, extending betweenthe side portions of a stationary bracket structure 116, which is disposed adjacent to therotatable housing 85. 7

stop projection 117 adapted to engage the under side or its associated lever 114, 114, for liniitingrotation of the-pawl in a counterclockwise direction about its pivot 112. The weight of the long outer arm of each tripping lever 114, 114;, normally tends to'hold said lever in the position indicated in full lines in Fig. 5, with the end of the short lever arm engaging a fixed stop 11,8, carried by the bracketstructure 116. l Vith each tripping lever in thisposition, the reactive thrustv of the associated ratchet wheel against the detent pawl 111 or 1 11 acts along a line which serves to hold the lever arms 113 or 113 pressed against the stop 118, that is to say, the lever arm and each detent pawl have the relation of two toggle links tending to force thepivot 112 upwardly or forwardly. To release each detent pawl, it is only necessary to break this toggle in a downward direction, such being accomplished by swinging the long arm ofgtheassociated tripping lever 114, 114' V in a rearward direction.

The trippinglever 114 is effective to drop the two front doors, through its release of the ratchet wheel 87 and winding shaft 39. The other tripping lever 114 is effective to drop the rear pair of doors, through its releaseof the other ratchet wheel and associated winding shaft 41. The latter tripping lever is actuatable at any time independently of the first mention'edlever for dropping the rear pair of doors. This will result in the dumping of the load in the rear compartment ofthe wagon without dumping the load in thefrontcompartment, the weight of this latter portion of the load being forward of the transverse pivot axis of the endless tread unitsj18" and, hence, maintaining the stability of the wagon. Provision is made, however, for preventing ,the front pair of doors from being dropped independently of the rear pair of doors, asit will be evident that the dumping of theload in the front compartment,

without dumping the load in the rear com of the companion projection 119. The pro-j jection 119 is disposed in .rearor below-the V projection 119, so, that its tripping lever 1 14 mountedjon pivots 112 and-supported by the 6. relatively short arms 113,113 of two b ell can be rocked backwardly anddownwardly ling corresponding movement of the other which might tend to tilt the front end of the wagon upwardly around the transverse pivot axis of the endless tread units. a 7

hen either pair of doors is dropped, the corresponding detent pawl 111 or 111 swings down to the position indicated approximately in dotted lines in Fig. 5. Whenthe pawl is restored to operative position, its proper engagement in the teeth of the associated ratchet wheel is assured by the engagement of the stop projection 117 with a shoulder 121 .on the bracket structure 116, whereby the pawl is caused to swing outwardly around the pivot 112 to a position substantially in prolongation of the short lever arm 113 or 113'. As each ratchet wheel is advanced in a doorlift-ing operation, theassociated tripping lever 114, or 114, oscillates slightly on the pivot shaft 115 as its detent pawl drops behind successive teeth of the wheel, the projection 117 maintaining the lever and. the

, pawl is substantially rigid relation during such oscillatory-movement of the tripping lever. I I.

VAs previously remarked, the weight ofthe long outer arm of the lever normally holds the detent pawl in the teeth, of the ratchet wheel, 7 r 7 It will be seen from the foregoing that both pairs of doors can be operated vtogether simultaneously, and in fact themechanism positively compels both pairs of doorsto drop simultaneously whenever the front pair of doors is tripped for dumping. Thus the mechanism can be operated so that both pairs of doors functionin the same manner as-a single pair of doors, i. e., the two longitudinally aligned doors along each side of the wagon then function as a single door extending entirely from end to end of the bed, with the intermediate space or notchbetween them serving to clear the adjacent axle bracket arm 24. V r

While we have described what we regard as the preferred embodiment of our invention, it will be-understood that such is mere- 1 ly exemplary and that numerous modifications and changes may be made therein without departing from the invention.

We claim 1. The combination with a dump wagon comprising two dump doors, of mechanism for raising said'doors to'closed position comprisingiflexible hoisting members, operatively connected with both doors, winding members on whichxsaid flexible hoisting members are wound, ratchet wheels individual to each of'said winding members, advancing pawls associated with each ,ofsaid ratchet wheels, acommon operating handle for transmitting movement to, both pawls, and

means comprising a selector member carried by and actuatable from said handle for selectively engagingv and disengaging :said pawls andtheir associated ratchetwheels.

'2. The combination-with asdump wagon comprising dump-doors, of mechanism for raising said doors to closed position comprising flexible hoisting members operatively connected with saiddoors, separatev winding drums on which the hoisting membersof said doors are wound, ratchet wheelsoperatively connected with each ofsaid winding drums,a swinging support rotating concentrically'of the axis of said ratchet wheels, in-

dividual advancing pawls for each of said ratchet wheels,i mounted on said swinging support, means normally tending to hold'said pawls out of operative engagement with their respective ratchet wheels, an operatinghandle extending from said swinging support,

two control rods extending longitudinallyof said operating handle and effective by thrusting movement to move said pawls into engagement with saidlratchet wheels, a lever mounted on said-handle member and operativeto transmit thrusting movement tosaid rods, and a selector membenassociated with said lever for establishing operative connection between said lever and eitheror bothof said rods whereby eitherlor; both of said pawls can be moved into operative engagement with their respective ratchet wheel's. 3. The combination with a dump wagon comprising dump doors, of mechanism for closing said doors comprising a winding drum, a ratchet wheelconnected therewith, means-for rotating said ratchet wheel to raise said doors, and releasable detentmechanism for holding said ratchet wheelagainst retrograde movement, said detent mechanism comprising a lever havingdiverging arms of different lengths, the shorter one of said arms I being pivotally mounted on a. substantially stationary axis tending to cause said lever to pivot in a clockwise direction, a detent pawl engaging said ratchet wheel and pivotally mounted .on the pivoted arm of said lever, and stop means cooperating with I said lever and arranged whereby said pawl and said pivoted lever arm haveia toggle action reacting through thepivotal axes of said lever for holding said said ratchet wheel. I

4. The combination with a dump vehicle,

comprising two dump doors, of mechanism for moving said doors to closed position, and

pawl in the teeth of use "release mechanism for permitting said doors to dump, said release mechanism comprising cooperating tripping members for releasing one-of said doors independently of the other door, but preventing release of the latter door independently of the first mentioneddoor.

-5. The combination: with-a dump vehicle,

comprising two dump doors, of mechanism for moving said doors to closed position, comprising two ratchet wheels, means operative 1 connecting each of said ratchet wheels individually withone of said doors, actuating means for operatingsaid ratchet wheels to close said doors, detent pawls for holding said ratchet wheels. against retrograde movement, and cooperating tripping members for releasing one of said pawls independently of ztheother but preventing release of the latter pawl independently of the first mentioned pawl;

6. A dump wagon, comprising a bed, a front pair-of dump doors disposed in the bottom of said bed, a rear pair of dump doors disposed in the'bottom of said bed, flexible EllOlStlllg members operatively connected with both pairs of doors, winding members on which said flexible hoisting members are wound, a first ratchet wheel connected with one-of saidwinding members and operative to raiselthe front-pair of doors, a second ratchetwheel connected with another of said winding members and operative to raise the rear pairof doors, means for advanclng said ratchet wheels'to raise said doors, a pair of sfront pairof doors also requires dumping of the rear pair of doors.

7. The combination with a dump vehicle comprising two dump doors, of mechanism for closlng said doors comprising a smgle operating handle, and means at one end of said handle comprising a selector member cooperating with a pair of advancing-pawls atthe-other end of said .lever whereby actuation ofsaicl handle is effectiveto close either ofsaid doors independently of the other.

8. The combination with a dump vehicle comprising two dump doors, otmechamsm for closing SZUClClOOTS' comprising a single operating'handlepand means comprising a selector member at one end of said handle, oooperating wrth a pair of advancing pawls at the other end of said lever whereby actuation of said handle is effective to-close said doors,

either selectively or simultaneously.

9. The combination with:a dump vehicle comprising 'two 'dnmp doors, of mechanism efiectivewhereby said lever is operative to actuate said winding devlces selectively or simultaneously.

10. The combination with-a dump wagon comprising two dump doors, of mechanism for closing said doors comprising individual winding drums operatlvely connected with said doors, two ratchet wheels individual to said winding drums, a single manually opher for rendering either or both of said pawls erated lever, and twoadvancing pawls associated with said lever, means normally holdmg said pawls out of engagement with said ratchet wheels, and a pawl selector member on'said lever whereby said lever is operative to transmit winding rotation selectively to either of said ratchet wheels, or simultaneously to both of said wheels.

11. The combination with a dump vehicle comprising two dump doors, of mechanism for closing said doors comprising a single operating handle,- means cooperating with said handle comprising two pawls and a selector member common thereto for rendering either of sand pawls operative whereby actuation of said handle is effective to'close either of said doors independently of the other, and release mechanism comprising tripping members for releasing one of said doors independently of the other.

12. The combination with a dump vehicle comprising two dump doors, of mechanism for closing said doorscomprising winding devices for each door, a single manually operated lever, means cooperating therewith whereby said lever is operative to actuate said winding devices selectively or simultaneously, and release mechanism for permitting said doors to dump, said release mechanism comprising cooperating tripping members for releasing one of said doors independently of the other door, but preventing release of the latter door independently of the first mentioned door.

18. The combination with a dump wagon comprising two dump doors, of'mechanism for moving said doors to closed position comprising two ratchet wheels, means operatively connecting each of said ratchet wheels individually with one of said doors, a single manually operated flever, means associated therewith whereby said lever is operative to transmit winding rotation selectively to either of said ratchet wheels, or simultaneously vto both .of said wheels, detent pawls for holding said ratchet wheels against retrograde movement, and cooperating tripping members for releasing one of said pawls independently of the other, but

preventing release of the latter pawl independently ofthe first mentioned pawl.

14. The combination with a dump wagon comprising dump doors, of mechanism'for raising said doors to closed position comprising flexible hoisting members operatively connected with said doors, separate winding drums on which the hoisting members of said doors are wound, individual advancing pawls for each of said ratchet wheels, an operating lever for imparting advancing movement to said pawls, two control rods extending longitudinally of said operating lever, said control rods being operatively connected with said advancing pawls whereby movement of said control rods is operative selectively to render said advancing pawls effective or noneffective for transmitting advancing movement to their respective ratchetwheels, and a grip actuated member carried by said operating lever for thus moving said control rods for selectively placing said advancing pawls inoperative condition.

15. The combination with a dump wagon comprising dump doors, of mechanism for closing said doors comprising two winding drums, ratchet wheels operatively connected with each of said wlnding drums, means for rotating said ratchet wheels to raise said 1: doors, and releasable detent mechanism for holding said ratchet wheels against retrograde movement, said 'detent mechanism comprising two levers plvotally mounted on a substantially stationary axis, two detent pawls engaging said ratchet wheels and each pivotally mounted on a swinging arm of the associated lever, stop means cooperating with each lever and detent pawl and arranged whereby said pawl and said lever arm have a toggle action for holding said pawl in the teeth of its associated ratchet wheel, and means operatively connecting said pawls whereby one of said pawls can be released independently of the other, but release of the latter pawl also necessitates release of the first-mentioned pawl.

16. The combination with a dump wagon comprising dump doors, of mechanism for raising said doors to closed position comprising flexible hoisting members operatively connected with said doors, separate winding drums on which the hoisting members of sa d doors are wound, ratchet wheels operatively connected with each of said winding drums, a swinging support rotating concentrically of the axis of said ratchet wheels, individual advancing pawls for each of said ratchet wheels mounted on said swinging support, an operating lever extending from said swinging support, two control rods extending longitudinally of said operating lever, said control rods being operatively connected with said advancing pawls whereby movement of said rods relatively to said operating lever is effective to moveone of said advancing pawls into or outof operative engagement with its individual ratchet wheel, and means comrods.

17. The combination with a dump vehicle comprising front and rear pairs of dump doors, of mechanism for raising said doors comprising first and second winding shafts, three winding drums mounted on said first shaft, a main hoisting chain connected with one of said drums and extending rearwardly along one side of the vehicle, an evener connected with the rear end of said main chain, two branch chains connected with said evener and extending forwardly below said front pairof doors, the front ends of said branch chains winding upon the other two drums on said first winding shaft, a winding drum on said second winding shaft, a main hoisting chain connected with said latter winding drum and extending rearwardly along the other. side of the vehicle, an evener connected to the rear end of said latter hoisting chain, two branch chains connected with said latter evener, eveners connected with the other ends of both of said latter branch chains, a pair of secondary branch chains extending between said last-named eveners and passing beneath the rear pair of dump doors for raising the same, and operating mechanism for actuating said first and second winding shafts.

18. A dump vehicle comprisinga bed, a

transverse dividing member in said bed, a pair of laterally swinging dump doors-010s ing the bottom of the bed adjacent to the front end thereof, a pair of laterally swinging dump doors closing the bottom ofsaid bed adjacent to the rear end thereof, winding drum mechanism mounted at the front end of the vehicle and disposed crosswise thereof on transversely extending shaft supporting means, two flexible hoisting members extending substantially from end to end of the front doors below the same and having their opposite ends operatively connected with said winding mechanism, and two flexible hoist,

lng members extending substantially from end to end of the rear doors below the same and having the opposite ends of both hoisting members operatively connected with said winding mechanism, equalizing members arranged in line with the ends of each hoisting member and said winding mechanism, whereby actuation of said winding mechanism appl es uniform lifting effort directly to both ends of either pair of doors through the associated hoisting members.

In witness whereof, we hereunto subscribe our names this 19th dav of December, 1928.

JAMES D. BENBOW. JAMES B. GREEN. 

